Bagaimana cara membuktian
1)cos(x+y).cos(x-y)=cos²y-sin²x
2)sin(x+y).sin(x-y)=sin²x-sin²y
1)cos(x+y).cos(x-y)=cos²y-sin²x
2)sin(x+y).sin(x-y)=sin²x-sin²y
" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
yang kedua juga sama aja pakai ID trigono dimana sin(x+y) = sinx cosy +cosx siny dan sin(x-y) = sinx cosy - cosx siny